Update _default.scss

_sass/_default.scss

@@ -2,7 +2,7 @@
  * Template Name: Orbit - Responsive Resume/CV Template for Developers
  * Version: 1.0
  * Author: Xiaoying Riley
- * Twitter: $3rdwave_themes
+ * Twitter: @3rdwave_themes
  * License: Creative Commons Attribution 3.0 License
  * Website: http://themes.3rdwavemedia.com/
 */